TE/TC Ghost Rev = Potential whiskey throttle

Okay folks I'm having an issue with my 2015 TE 250 and would appreciate any feed back or suggestions before I pull the carb, throttle and throttle cable again to re- investigate. During the last 2 rides the engine started to rev wildly 4 random times over several hours. Each incident occurred when hammering at whoops. I pulled in the clutch (thankfully I always have a finger or 2 on the clutch lever) and took my hand off the throttle and the engine continued to rev wildly. I even blipped the throttle once or twice to no avail. I resorted to hitting the kill switch then checking for skid marks . Once I restarted the bike it ran normal for a spell.
So far I eliminated the following potential problems: Throttle grip (plenty of space between the grip housing and bark buster), cable and slide spring seem to be clean and functioning properly. Each time the throttle grip was in the fully retracted position and there is doesn't appear to be an issue with cable routing. I'm thinking that it could be an issue with the float height - but not sure. Any thoughts or suggestion?

Sounds like an airleak to me.... Do like Landofmotards said.... spray carb cleaner all around your running engine....

or throttle cable may be hanging up on something...com

damn...

this is real issue. 2 weeks ago, my friend experienced same issue in steep rocky section. he is in the hospital still.

1st question I ask is what has the operator done to the this bike?
Or is it straight from the showroom 100% OEM stock?.
If straight from the showroom OEM stock I would immediately get it back to the dealer (and not because I cant troubleshoot, because its new off the showroom and fffing up in a dangerous way).
if you are deciding to keep it have all intake related hardware been checked for security.
Next check the throttle cable for pulling conditions and verify that the cable is not popping up from the top cap and pulling (not rare) of the carb or getting somehow jammed up in the throttle housing (rare).
carb slide spring and carb slide bore not binding.

4th don't everyone get on the KTM Husky this is trend and ongoing problem internet train.....2 claimed unresolved/unproven issues do not constitute a trend/ or across the board fail issue.

I will let the owner of that Husky respond here with details when he can. I did let him know about this thread. I don't want to contribute to any misinformation. all I know is that he is very experienced rider and rode that trail 100 times. and it did not seem like he whiskey trottled the bike. I looked over the bike when walking the bike off the mountain (bike was not ride-able on own power) and I did not see any obvious problems and throttle worked nice and smooth.

Hmm, interesting. I purchased my bike new in December and haven't made any modifications to the engine, carb or throttle cable. I'm going to check for air leakage as suggested and take another look at the cable and slide as well. Thanks everyone, I will keep you posted.

Back to the dealer I say, yep air leak or even if u,added hand guards even changed the grips or anything. I do believe there are a few bikes from every manufacturer that have gremlins. Keep us posted.

I had a Beta 2-stroke do this to me. Came out of a corner poured on the gas and it never quit. Luckily I had the presence of mind to grab the clutch and hit the kill switch. The next corner and trees were fast approaching. Never happened again on that bike. Strange...

I was off work for 9 weeks after surgery for ligament repair due to a tear in the air boot between the air filter and carb. It was on an older 85 Suzuki rm 250 with a new pipe I was trying out. I had never had a problem until the day I was checking out the new pipe and under acceleration the bike over rev'ed. After the first over-rev I should have stopped and investigated but I chose to try one more ride thinking it was trash in carb. My son said it was a spectacular loop out. Might be worth checking the air boots for tightness as well as tears or holes. My two cents worth, good luck.

You may be able to tell by the engine sound (if it repeats and you don't die) as an air leak lean rev sounds different than a full throated carb slide stuck open rev. Cam.

Went over the bike today: Throttle clean and adjusted, cable clean and routed properly. Checked for air leaks as suggested from the air box - carb - cylinder - head- lower end to exhaust, negative results.

Called my dealer and explained the entire scenario, he told me to check the float. I pulled the carb, turned upside down and removed float bowl. Sure enough there was zero action in the float. It was sitting flat with no spring action. So the theory is that when I am hammering through the whoops it was dumping fuel into the engine. Does this make sense? Anyway I adjusted the tang. Hopefully this is the culprit. We shall see.

Id say it was hanging up and making the bike super lean...

Ghost Rev.

That float action above is a little confusing ...

When in the upside position, the floats should push the pointed end of that dangling valve into the seat, shutting off the fuel ... The spring-action (I guess you are looking for) comes from the same valve but has nothing to do with the tab sitting ... The spring action comes from the opposite end of the same valve .... On the opposite end of the pointed end, dangling directly under the tap and touching the tab, is another small part of the valve that should move and out of valve itself and feels spring loaded inside the valve ... That small movement provides any spring action for the float mechanism ... Not the tab piece itself ...

Not sure if that is your 'Casper' issue but that is the only spring associated with the floats I can think of ..

Most that stuff in a CARB is very clunky and looks like it was designed 100 yrs ago as it was; it still works AOK today unless dirty (ethanol caused due to sitting too long) in most cases ...

Dang that tang and it should have been left on the moon.

--

Too bad Casper probably only exists in re-runs and he was a good guy ... Same as, say, Snoopy and the Peanuts gang...

Hi Ray Ray. My apologies, I may not have described it correctly. Bottom line is my dealer advised me that by slightly bending the metal tang thing it would adjust the float height and should solve my issue. So far it seems fine.

My 2015 te300 stuck twice last week and once this week. Mine did did not stick wide open tho. I was more just putting in second and third gear and it started to stick. It didn't take of just stuck a little. I grab the clutch and it resolved itself. I'm going to start checking things out tomorrow

Of course a friend of mine had this happen to his 07 KTM. Turned out he had incorrectly ran the throttle cable in front of the number plate instead of behind it. He damn near killed himself. Happened over a year ago and he still isn't quite right.

I did not open the carb up but the cable seems to be good. I adjusted kt a bit and I lubed it up. I plan on riding sunday so I will see if it's fixed. Even tho this is my favorite bike I have ever owned this is making me want to sell if for a 501

Just to follow up with my original post. I painstakingly adjusted the float back in May and haven't had a problem since. My confidence has been restored.